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3-1/2 DIGIT A/D CONVERTERS

TC7106

TC7106A

TC7107

TC7107A

Decimal Point and Annunciator Drive

The TEST pin is connected to the internally-generated digital logic supply ground through a 500 W resistor. The TEST pin may be used as the negative supply for external CMOS gate segment drivers. LCD display annunciators for decimal points, low battery indication, or function indication may be added without adding an additional supply. No more than 1mA should be supplied by the TEST pin: its potential is approximately 5V below V+.

V+	V+
V+
	4049
TC7106A
BP 21	TO LCD
BP 21	DECIMAL
	POINT
TEST 37	GND
TEST 37
	TO LCD
	BACK-
	PLANE


V+
	BP
		DECIMAL
TC7106A		POINT
TC7106A		SELECT
		SELECT
TEST

V+

TO LCD

DECIMAL

POINTS

4030

GND

Ratiometric Resistance Measurements

The true differential input and differential reference make ratiometric reading possible. Typically in a ratiometric operation, an unknown resistance is measured with respect to a known standard resistance. No accurately defined reference voltage is needed.

The unknown resistance is put in series with a known standard and a current passed through the pair. The voltage developed across the unknown is applied to the input and the voltage across the known resistor is applied to the reference input. If the unknown equals the standard, the display will read 1000. The displayed reading can be determined from the following expression:

Displayed Reading =	R Unknown	x 1000
	R Standard

The display will overrange for R Unknown ³ 2 x R standard.

	VREF+	V+
RSTANDARD	VREF–
	VIN+	LCD DISPLAY
RUNKNOWN	TC7106A
	VIN–
	ANALOG
	COMMON

Figure 17. Low Parts Count Ratiometric Resistance

Measurement

Figure 16. Decimal Point Drive Using TEST as Logic Ground

3-198

TELCOM SEMICONDUCTOR, INC.

3-1/2 DIGIT A/D CONVERTERS

TC7106 1 TC7106A

TC7107

TC7107A

IN4148			1 F	+
IN4148			1 F	–
200mV				–
VIN		10kΩ
9MΩ		10kΩ
9MΩ
2 V	0.02	1MΩ
	0.02
	F
	F
900kΩ		1MΩ
20 V
	47kΩ		–
90kΩ	1 W	6.8 F	–
90kΩ	1 W	6.8 F	+
200 V	10%		+
10kΩ
		20kW
COM		10%
COM
C1 = 3–10pF VARIABLE,
C2 = 132pF VARIABLE

									+				9V		26
									+				9V


									1		V+			V	–	27
1		14							1					V	–	27
1		14
				24kΩ
2		13											TC7106A			29
2		13

3		12				1kΩ			36	+
									36	+
4	AD636	11							35		VREF					28
									35			–				28
5		10							32		VREF
											ANALOG
6		9
6		9			1MΩ 10%
					1MΩ 10%				31		COMMON					40
7		8							31	+						40
											VIN
			2.2 F				0.01				VIN
							0.01
								F	30			–				38
								F

											VIN
									26							39

											V–
											V–

SEG	BP
DRIVE

LCD DISPLAY

Figure 18. 3 1/2 Digit True RMS AC DMM

			+		9V				+	9V
160kΩ		300kΩ	300kΩ			5.6kΩ			160kΩ
160kΩ		300kΩ	300kΩ						V+	V–
			V+		V–				V+	V–
			–			1N914		R1	–
			VIN			1N914		R1	VIN
		R1	V+					20kΩ
1N4148		R1	V+						+	TC7106A
SENSOR		50kΩ	IN	TC7106A					VIN	TC7106A
SENSOR		50kΩ		TC7106A					VIN
				VFS	= 2V			R2
R			+		0.7%/°C	R		R2	+
	2		VREF		PTC		3	20kΩ	VREF
50kΩ
			–						–
			VREF						VREF
			COMMON						COMMON

Figure 19. Temperature Sensor	Figure 20. Positive Temperature Coefficient Resistor
	Temperature Sensor

TELCOM SEMICONDUCTOR, INC.

3-199

3-1/2 DIGIT A/D CONVERTERS

TC7106

TC7106A

TC7107

TC7107A

9V
2			CONSTANT 5 V				1
V+			CONSTANT 5 V				V+
V+							V+
							+
							VREF
REF02	V	6	51kΩ	5.1kΩ	TC911	50kΩ	TC7106A
	V	OUT				R2	–
		OUT	R4	R5		R2	VREF
			R4	R5
		5		2	8		VFS = 2.00V
		ADJ	NC	–	8
		ADJ	NC		1		–


		3		3		VOUT =	VIN
	TEMP			+	4	VOUT =	+
						1.86V @	+
						1.86V @	VIN
			TEMPERATURE			25°C
			TEMPERATURE			50kΩ
			DEPENDENT	1.3k		R1	COMMON
			OUTPUT
GND							V–
4							26

Figure 21. Integrated Circuit Temperature Sensor

	TO PIN 1
	40	SET VREF = 100mV
	40	100kΩ
	39	100kΩ
	39
	38
	37	100pF
	36
	35		1 k Ω	22kΩ
	34	0.1 F	1 k Ω	22kΩ
	33	0.1 F		1MΩ	+
	33			1MΩ	+
	32
TC7106A	31		0.01 F		IN
	30	0.47 F		+	–
	29	0.47 F	47kΩ	+	–
	29				9V
	28
	28			–
	27	0.22 F		–
	26	0.22 F
	26
	25
	24	TO DISPLAY
	23	TO DISPLAY
	23
	22
	21	TO BACKPLANE

	TO PIN 1
	40		SET VREF = 100mV
	40		100kΩ
	39		100kΩ
	39
	38
	37		100pF
	36
	35			1kΩ	22kΩ	+5V
	34	0.1 F		1kΩ	22kΩ
	33	0.1 F			1MΩ	+
	33				1MΩ	+
	32
TC7107A	31				0.01 F	IN
TC7107A	30	0.47 F				–
	29	0.47 F				–
	29			47kΩ
	28			47kΩ
	28
	27	0.22 F
	26	0.22 F				–5V
	26					–5V
	25
	24	TO DISPLAY
	23	TO DISPLAY
	23
	22
	21

Figure 22. TC7106A Using the Internal Reference: 200mV Full-	Figure 23. TC7107A Internal Reference (200mV Full-Scale,
Scale, 3 Readings-per-second (RPS).	3RPS, VIN– Tied to GND for Single Ended Inputs).

3-200

TELCOM SEMICONDUCTOR, INC.

3-1/2 DIGIT A/D CONVERTERS

TC7106 1 TC7106A

TC7107

TC7107A

V+	1	40
	1	40
TO
LOGIC
VCC		TO
		LOGIC
		GND
		TC7106A
O/R		V–
O/R
U/R
	20	21
CD4023
OR 74C10
CD4077	O/R = OVERRANGE
	U/R = UNDERRANGE

Figure 24. Circuit for Developing Underrange and Overrange Signals from TC7106A Outputs.

	TO PIN 1					2
	TO PIN 1
	40	100kΩ	SET VREF = 1V
	40
	39
	39
	38
	37	100pF		Ω
	36			Ω
	36			24k	V+
	35		25k	Ω	V+
	34	0.1 F	25k	Ω		3
	33	0.1 F		1MΩ	+
	33			1MΩ	+
	32			0.01 F	IN
TC7106A	31			0.01 F	IN
TC7106A	30
TC7107A	30	0.047 F			–
TC7107A	29	0.047 F	470kΩ		–
	29
	28
	28
	27	0.22 F			V –
	26	0.22 F			V –
	25
	24	TO DISPLAY				4
	23	TO DISPLAY
	23
	22
	22
	21

Figure 25. TC7106A/TC7107A: Recommended Component

Values for 2.00V Full-Scale

	TO PIN 1							TO PIN 1						5
	40		100kΩ					40		100kΩ
	39		100kΩ	SET VREF	= 100mV			39		100kΩ	SET VREF	= 100mV
	39			SET VREF	= 100mV			39			SET VREF	= 100mV
	38							38
	37		100pF	10kΩ	10kΩ			37		100pF		10kΩ
	36			10kΩ	10kΩ	V +		36			10k Ω	10kΩ	V+
	35		1kΩ			V +		35		1 kΩ			V+
	34		1kΩ		TC04			34		1 kΩ		TC04		6
	33	0.1 F			TC04	+		33	0.1 F			TC04	+
		0.1 F		1.2V					0.1 F		1.2V
				1.2V							1.2V
	32							32
	31			0.01 F	1MΩ	IN	TC7107A	31			0.01 F	1MΩ	IN
TC7107A	30						TC7107A	30
TC7107A	30	0.47 F				–		30	0.47 F				–
	29	0.47 F		47kΩ		–		29	0.47 F		47kΩ		–
	29							29
	28							28
	28							28
	27	0.22 F				V –		27	0.22 F
	26	0.22 F				V –		26	0.22 F
	25							25
	24	TO DISPLAY						24	TO DISPLAY					7
	23	TO DISPLAY						23	TO DISPLAY
	23							23
	22							22
	22							22
	21							21

Figure 26. TC7107A With a 1.2V External Band-Gap Reference.	Figure 27. TC7107A Operated from Single +5V Supply. An
(VIN– Tied to Common.)	External Reference Must Be Used in This Application.

TELCOM SEMICONDUCTOR, INC.

3-201

Источник: https://studfile.net/preview/16460446/

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